My DIY custom tachometer scan gauge

Discussion in 'Gen 4 Prius Accessories and Modifications' started by neiman, Nov 25, 2020.

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  1. neiman

    neiman New Member

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    I am very excited to share my project with this forum! I have spent the last few months working on it in my spare time.

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    I have been very curious about the mysterious behavior of my Prius. I decided to create this scan gauge to view RPM and engine temp. It is powered by an Arduino microcontroller and a CAN bus controller. I decided to take the hard route so there is no traditional ELM327 (regular bluetooth or usb) scan tool hardware in this project!

    I have code posted on GitHub if anyone is interested in making their own.
     
    #1 neiman, Nov 25, 2020
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  2. alanclarkeau

    alanclarkeau Senior Member

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    I presume it's ICE RPM, not MG1 or MG2.

    All I can think - yes, it will give you very curious readings. There was talk on, I think the LEXUS forum about a hybrid with a tachometer - and it seemed to not be useful. Just a curiosity.
     
    #2 alanclarkeau, Nov 25, 2020
  3. Mendel Leisk

    Mendel Leisk Senior Member

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    It could be reading anything? Coolant temp'd be cool too.

    Sorry, initial post says this is possible.
     
    #3 Mendel Leisk, Nov 25, 2020
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  4. fuzzy1

    fuzzy1 Senior Member

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    Any connection to the MPGuino, talked about some here and on other efficiency and modder forums since before my time?
     
    #4 fuzzy1, Nov 25, 2020
  5. neiman

    neiman New Member

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    Ah yes, I've seen that before. That was one of my sources of inspiration. MPGuino has a simpler principle of operation. My design is a little bit more complicated...uses OBD protocol over the CAN bus. I could really request any data I wanted from the ECU.
     
    #5 neiman, Nov 26, 2020
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  6. neiman

    neiman New Member

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    It is indeed ICE RPM. I am very curious to read what the traction motor RPMs are. It may give me more insight into the vehicle's top speed on electric only power. I know that there are a whole bunch of Prius-specific PIDs that can be requested from the ECU. I am very curious to see what I can find out from tinkering and experimenting.
     
    #6 neiman, Nov 26, 2020
  7. Mendel Leisk

    Mendel Leisk Senior Member

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    There's a spreadsheet on the net listing scangauge xgauges, might be helpful.
     
    #7 Mendel Leisk, Nov 26, 2020
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  8. neiman

    neiman New Member

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    This bad boy right here?

    Will require some poking around. This will be a challenge since those don't look like regular OBD PIDs. I'm not sure how exactly they are implemented in the scan gauge. Something to keep me busy I suppose.
     
    #8 neiman, Nov 28, 2020
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  9. Mendel Leisk

    Mendel Leisk Senior Member

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    Yes I believe so. Just viewing on phone currently, so looks a little odd.
     
    #9 Mendel Leisk, Nov 28, 2020
  10. neiman

    neiman New Member

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    #10 neiman, Nov 29, 2020
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